Yep. Vampires are parasites, but do make pretty good villains. I am actually currently writing a vampire novel in which I am attempting to give vampirism some serious downsides. Reasons to avoid becoming one. I don't think that that's seen enough in modern literature.
On the other hand, I am also drawing on the literary idea of the sympathetic vampire, which was seen in literature before Dracula was published, in the penny dreadful, Varney the Vampyre. The difference, of course, between Varney and later sympathetic vampires is that Varney is only sympathetic because he hates what he is, and wants to cure himself. Something that is noticeably lacking in modern "sympathetic" vampires. How sympathetic can someone be if they're perfectly fine with staying a bloodsucking parasite?